unicorn.rb

app_root = "/root/path/of/app"
app_name = "demoapp"
listen "/tmp/app.sock", :backlog => 2048 #這邊要跟nginx虛擬主機檔中upstream內定義的務必一樣
worker_processes 4 #看情況開
preload_app false
timeout 30

module Rails
  class <<self
    def root
      File.expand_path(__FILE__).split('/')[0..-3].join('/')
    end
  end
end
_working_directory = File.join(app_root, app_name, "current")
working_directory _working_directory
logs_path = "#{_working_directory}/log"
pid "#{_working_directory}/tmp/pids/unicorn.pid"
stderr_path "#{logs_path}/unicorn.stderr.log"
stdout_path "#{logs_path}/unicorn.stdout.log"

GC.respond_to?(:copy_on_write_friendly=) and GC.copy_on_write_friendly = true

before_fork do |server, worker|
  defined?(ActiveRecord::Base) and ActiveRecord::Base.connection.disconnect!
  
  old_pid = "#{Rails.root}/tmp/pids/unicorn.pid.oldbin"
  if File.exists?(old_pid) && server.pid != old_pid
    begin
      Process.kill("QUIT", File.read(old_pid).to_i)
    rescue Errno::ENOENT, Errno::ESRCH
      puts "Send 'QUIT' signal to unicorn error!"
    end
  end
end

after_fork do |server, worker|
  defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
end